Fountain pen



H. GOULOT' I FOUNTAIN PEN May 22, 1951 Filed Feb. 26, 1946 G G a G 4 G HENRI 'QOULOT- \NVENT on BY 3km wadwmn ATTORNEY5 Patented May 22, 1951 FOUNTAIN PEN HenrrGoulot, ,Colombes, France, assignor to. Joseph Erentzel, Paris, France Application FebruaryZfi, 1946, Serial No. 650,202 In France June 7, 1945 4'. Claims. (Cl. 120-47) invention. has for its object. improvements in fountainpensprovided with a, piston operated filling. device. Said invention covers more particularly means'for increasing the capacity of the ink container in fountain pensof this type; while it: allows. an easy and speedy. filling through: a single operation.

To this purpose,;my; improved fountain pen is chiefly characterized bythefact that" the: filling piston moving; inside the-fountain pen body is formedby atubularmember housing a very long springjheldbetween the bottom of the piston and the; opposite endof. said body; this spring is solely by way of example a form of execution of the invention.

In said. drawing:

Fig. 1 is a crosseseetional. view of: the Whole fountain pen.

Fig, 2'is a cross section at alarger scaleof a form of execution of the fluid-tight arrangement for the piston;

The fountain pen provided with a filling piston executed in accordance; with my invention includes a. tube, I forming thebody. orv container of the pen and to the end'of which is screwed, the section 2 carrying the nib 3 while the other end of the tube" 1* is screwed into a" guiding plug 4 inside: which the filling piston 5 is adapted-Ito slide.

Accordingito. my. invention, .said;.piston is; hollow :and its: outwardly. closed :innercapacity opens into thatiof thetube L. Its'length is such that in normalpositionitnprojects. considerably to the outside of the tube whileeduringthe filling-operation itmay beurgedsufficiently far forait's. inner end'to abut against thezb'ottom ofl'the container. The projectingpart of. the piston is protectedby ashood or: capfiscrewedoverthe guiding plug. l.

Said piston may slide with slight friction inside the body I of the pen and a suitable packing 1' 21 the detail of which is disclosed hereinafter is: provided for ensuring; perfect fluid tightness; of the piston; The piston carries moreovera flange or stop shoulder B- abutting against the guiding plug 0 at'theendof its outward motion.

According to-an important feature of my invention, there is providedinsi'de the piston 5, an elongated spring 9 which: may bepmade' of stainlesssteel or the like inoxidisable metaland said spring bearson one hand against the bottomof the piston 5 and on the other hand against a" washer l0 bearing in itsturnagainst-the nib carrying sectionlof the; pen; The' washer Ill-is rovided with: a recess; H and. with ports: 5'2 adapted to provide a passage for theinkfrom-the inner chamber l3 or container: of. thepen-intor the pen feeding; duct and reversely:

The washer Hl carries also a-rod l4 serving-as. a guiding member for thespring ll'. This spring is established in a manner suchthatatlthe end of. the compressionaljstroke of the piston 5,- the coils of said spring-may berin=close contact withone another so-as tofillsubstantially-the entire space comprised between the; rod i4 and. the inner wall ,of the piston.

By reason of this-particular construction, the air is completely forced out-of'the container when the piston'is urged into the tube I- up to-thei end of its allowed stroke. Consequently during the returner suction stroke,-. the ink; may fill; completely thespace-open'to-it insidethe-body l and inside the hollow part ofthepistoni: By reason of the-longstroke-ofthepiston, it is-possibleto suck in a large volume of ink in a single; pumping stroke.

I- obtain thus a large capacity fountain pen which requires forits filling; a single reciprocation of the-pistOn-Esinstead of requiring repeated operation as; in -most fountain, pens presently on the market and provided'withra' pump for filling purposes; the filling mechanism occupying in such. fountain: pens" a considerable-bulk:

Further; since spring 9' is comparatively long and hasytherefore azgreat: number. of turns; the difierence between theresistance: ofiered: by said spring at the beginning and: at: the? end: of. the movement is relatively small.

Lastly the execution of the fountain. pen as a whole is. particularly simple; In particular the body I of the container assumes the shape. of. a tube open at both-ends and'may'thereforeibeeasily and accurately bored; which isof particular importance for the fluid-tightness of the: piston.

Fig. 2 shows; a: particularly advantageous: form of execution of the water-tight ring-shaped packing 1 for the piston 5; this packing is held by a groove in the piston having a diameter d and forming two shoulders I5 for securing the fluid tight packing; the latter is made of an elastic material which allows its easy insertion. It shows two bevelled lips l6 and I7 at the opposite outer edges of the packing; one of said lips it provides for watertightness in the direction of the arrow fl whereby it prevents the ink from flowing out of the chamber or container 13 while the other I! provides for fluidtightness in the opposite direction which is that of the arrow f2 so as to prevent the air from returning into the chamber I3 during the filling of the pen through the operation of the piston.

An annular groove l8 provides a greater elasticity for the ring-shaped packing in its medial plane and it prevents it moreover from forming in said plane a head or swelling which would detrimentally affect the ease of operation. More over, according to one of the chief features of the invention, said groove may be filled with lubricating material such as oil or parafllne which makes the sliding of the piston easier and allows a very great ease of operation for the filling piston: e. g. such a lubricating material may be a pasty compound of graphite and neutral grease having no action whatsoever on the ink. This pasty compound forms a definite layer on the inner wall of the fountain pen without ever mixing with the ink.

The diameter at the outer edge of the lips 15 and I1 is provided slightly larger than the inner diameter of the container constituted by the tube I so that the elasticity of these lips may compensate for the unavoidable defects in boring and allows in fact the bore to be executed with a grade of machining which is lower than that required in usual piston fountain pens in which the fluid tight packing is constituted by cork or a rubber ring of a different shape. This arrangement allows also executing a simple one-piece piston without any nut or screw for securing the fluidtight packing. It reduces also to the indispensible minimum the difference between the inner and outer diameters D and d of the packing 1; this allows the piston to receive a sufficient diameter for it to be formed as a hollow member with a sufficient inner bore.

Lastly it is apparent that the execution of the piston and of its packing is extremely simple and that the mounting of the ring 1 on the piston is very easy, which allows changing it very easily when required.

Obviously my improved fountain pen described hereinabove and illustrated in the drawing has been given out solely by way of example. It may receive certain modifications in its details of execution without the general principle underlying my invention being altered thereby. Thus in particular the section 2 instead of being screwed into the body I may form a single member with said body. Similarly the rod M- and the washer I0 instead of being formed in one may be divided into two distinct parts rigidly secured to one another.

What I claim is:

1. A fountain pen comprising a hollow body, a nib-carrying end thereof, a hollow piston arranged for sliding inside said hollow body and the inner capacity of which opens into the same, the length of the piston being slightly greater than that of its stroke inside said hollow body, in combination with a spring arranged axially in the body and the piston and bearing against the nib-carrying end and the closed end of the piston, respectively, and a rod engaged within the spring and passing axially through the body and a portion of the hollow capacity of the piston, said spring and said rod occupying substan-' tially the Whole of the inner capacity of the piston when the spring is compressed by driving the piston the maximum distance within said hollow body.

2. A fountain pen as claimed in claim 1 wherein the spring-engaging rod is solid and is integral with the nib-carrying end.

3. A fountain pen comprising a hollow body, a nib-carrying end thereof, an outwardly grooved hollow piston arranged for sliding inside said hollow body and the inner capacity of which opens into the same, the length of the piston being slightly greater than that of its stroke inside said hollow body, in combination with a spring arranged axially in the body and the piston and bearing against the nib-carrying end and the closed end of the piston, respectively, and a rod engaged within the spring and passing axially through the body and a portion of the hollow capacity of the piston, said spring and said rod occupying substantially the whole of the inner capacity of the piston when the spring is compressed by driving the piston the maximum distance within said hollow body, and a fluidtight packing carried by the inner end of the piston inside the groove on the outer wall thereof, said packing having two lips extending laterally of the length of the pen directed forward and backward from the main part of the packing and adapted to slide over the inner surface of the body.

4. A fountain pen comprising a hollow body, a nib-carrying end thereof, a hollow piston arranged for sliding inside said hollow body and the inner capacity of which opens into the same, the length of the piston being slightly greater than that of its stroke inside said hollow body, in combination with a spring arranged axially in the body and the piston and bearing against the nib-carrying end and the closed end of the piston, respectively, and a solid rod secured to the nib-carrying end of the hollow body engaged within the spring and passing axially through the body and a portion of the hollow capacity of the piston, said spring and said rod occupying substantially the whole of the inner capacity of the piston when the spring is compressed by driving the piston the maximum distance within said hollow body.

HENRI GOULOT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,464,218 Regero Aug. 7, 1923 1,746,758 Ashley Feb. 11, 1930 1,772,628 Fritsch Aug. 12, 1930 1,903,022 Bassett Mar. 28', 1933 1,926,405 Polk Sept. 12, 1933 1,967,315 McBean July 24, 1934 2,027,656 Tassie Jan. 14, 1936 2,295,160 Christenson Sept. 8, 1942 2,309,446 Ekkebus Jan. 26, 1943 2,455,725 Bell Dec. 7, 1948 

